fix: correctly serialize negative numbers (#2790)

This commit fixes a bug where negative numbers were not correctly
serialized, because the value parser confused "references" (which is
where special negative tokens for special values exist), and "values"
(where negative numbers are just negative numbers). The parser now
correctly distinguishes between the two.

deno.json

@@ -65,7 +65,8 @@
     "@marvinh-test/fresh-island": "jsr:@marvinh-test/fresh-island@^0.0.1",
     "linkedom": "npm:linkedom@^0.16.11",
     "@std/async": "jsr:@std/async@1",
-    "@std/expect": "jsr:@std/expect@1"
+    "@std/expect": "jsr:@std/expect@1",
+    "@std/testing": "jsr:@std/testing@1"
   },
   "compilerOptions": {
     "lib": ["dom", "dom.asynciterable", "deno.ns", "deno.unstable"],

src/jsonify/__snapshots__/round_trip_test.ts.snap

@@ -0,0 +1,55 @@
+export const snapshot = {};
+
+snapshot[`round trip - undefined 1`] = `"-1"`;
+
+snapshot[`round trip - null 1`] = `"-2"`;
+
+snapshot[`round trip - 1 1`] = `"[1]"`;
+
+snapshot[`round trip - 2 1`] = `"[2]"`;
+
+snapshot[`round trip - -2 1`] = `"[-2]"`;
+
+snapshot[`round trip - Infinity 1`] = `"-4"`;
+
+snapshot[`round trip - -Infinity 1`] = `"-5"`;
+
+snapshot[`round trip - 0 1`] = `"[0]"`;
+
+snapshot[`round trip - -0 1`] = `"-6"`;
+
+snapshot[`round trip - NaN 1`] = `"-3"`;
+
+snapshot[`round trip - 0 2`] = `"[0]"`;
+
+snapshot[`round trip - true 1`] = `"[true]"`;
+
+snapshot[`round trip - false 1`] = `"[false]"`;
+
+snapshot[`round trip - 'abc' 1`] = `'["abc"]'`;
+
+snapshot[`round trip - 1n 1`] = `'[["BigInt","1"]]'`;
+
+snapshot[`round trip - -1n 1`] = `'[["BigInt","-1"]]'`;
+
+snapshot[`round trip - [ 1, 2, 3 ] 1`] = `"[[1,2,3],1,2,3]"`;
+
+snapshot[`round trip - [ null, undefined, -2 ] 1`] = `"[[-2,-1,1],-2]"`;
+
+snapshot[`round trip - { a: 1, b: null, c: -2 } 1`] = `'[{"a":1,"b":-2,"c":2},1,-2]'`;
+
+snapshot[`round trip - Uint8Array(3) [ 1, 2, 3 ] 1`] = `'[["Uint8Array","AQID"]]'`;
+
+snapshot[`round trip - 1990-05-31T00:00:00.000Z 1`] = `'[["Date","1990-05-31T00:00:00.000Z"]]'`;
+
+snapshot[`round trip - Map(2) { 1 => null, undefined => -2 } 1`] = `'[["Map",[1,-2,-1,2]],1,-2]'`;
+
+snapshot[`round trip - Set(5) { 1, 2, null, -2, NaN } 1`] = `'[["Set",[1,2,-2,3,-3]],1,2,-2]'`;
+
+snapshot[`round trip - [ 1, <1 empty item>, 3 ] 1`] = `"[[1,-7,2],1,3]"`;
+
+snapshot[`round trip - /foo["]/ 1`] = `'[["RegExp","foo[\\\\"]", ""]]'`;
+
+snapshot[`round trip - { a: { foo: 123 }, b: [ { foo: 123 }, { foo: 123 } ] } 1`] = `'[{"a":1,"b":3},{"foo":2},123,[1,1]]'`;
+
+snapshot[`round trip - <ref *1> { a: 1, b: [Circular *1] } 1`] = `'[{"a":1,"b":0},1]'`;